Efficiency of integrated waveguide probes in the detection of fluorescence and backscattered light

N. Ismail, F. Sun, F. Çivitci, Kerstin Worhoff, R.M. de Ridder, Markus Pollnau, A. Driessen

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review


    Integrated optical probes for detecting backscattered light in, e.g., Raman spectroscopy show desirable characteristics compared to conventional optical fiber probes, although the latter ones may have better collection efficiency in many cases. Major advantages of integrated probes include reduced size; reduced background noise due to scattering in the probe because of reduced propagation length; potential for monolithic integration with filters and spectrometers; very small collection volume, providing high spatial resolution; and polarization maintenance. We demonstrate that when scattered light needs to be collected from a thin layer close to the probe surface, integrated probes can have better collection efficiency than fiber probes do. We modeled a multimode integrated waveguide probe by adapting an analytical model that had been developed for fiber probes. The model was extended in order to account for arbitrary waveguide geometries and a low number of discrete waveguide modes compared to the quasi-continuum of modes in a typical multimode fiber. Using this model we compared the collection efficiencies of integrated and fiber probes for a thin scattering sample. We found that the integrated probe has a higher collection efficiency for scattering layer thickness and probe-to-layer distance both smaller than ~100 um.
    Original languageUndefined
    Title of host publicationPhotonics West
    EditorsIsrael Gannot
    Place of PublicationBellingham, WA, USA
    PublisherSPIE - The International Society for Optical Engineering
    Number of pages5
    ISBN (Print)9780819479556
    Publication statusPublished - Feb 2010
    EventOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications X - San Francisco, California, USA
    Duration: 23 Jan 201023 Jan 2010

    Publication series

    NameProceedings of the SPIE
    PublisherSPIE, the international Society for Optical Engineering
    ISSN (Print)0277-786X


    ConferenceOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications X
    Other23 Jan 2010


    • METIS-270763
    • Spectroscopy
    • Waveguides
    • Probes
    • EWI-17681
    • Fibers
    • IR-70413
    • Scattering

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